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  <title>Retrieve the key for the current file</title>

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</div><hr /><div id="filesystemiterator.key" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">FilesystemIterator::key</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.3.0)</p><p class="refpurpose"><span class="refname">FilesystemIterator::key</span> &mdash; <span class="dc-title">Retrieve the key for the current file</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-filesystemiterator.key-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">string</span> <span class="methodname"><strong>FilesystemIterator::key</strong></span>
    ( <span class="methodparam">void</span>
   )</div>

 </div>


 <div class="refsect1 parameters" id="refsect1-filesystemiterator.key-parameters">
  <h3 class="title">参数</h3>
  <p class="para">此函数没有参数。</p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-filesystemiterator.key-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the pathname or filename depending on the set flags.
   See the <a href="class.filesystemiterator.html#filesystemiterator.constants" class="link">FilesystemIterator constants</a>.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-filesystemiterator.key-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3782">
    <p><strong>Example #1 <span class="methodname"><strong>FilesystemIterator::key()</strong></span> example</strong></p>
    <div class="example-contents"><p>
     This example will list the contents of the directory containing the script.
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$iterator&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">FilesystemIterator</span><span style="color: #007700">(</span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">),&nbsp;</span><span style="color: #0000BB">FilesystemIterator</span><span style="color: #007700">::</span><span style="color: #0000BB">KEY_AS_FILENAME</span><span style="color: #007700">);<br />foreach&nbsp;(</span><span style="color: #0000BB">$iterator&nbsp;</span><span style="color: #007700">as&nbsp;</span><span style="color: #0000BB">$fileinfo</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$iterator</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">key</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
apple.jpg
banana.jpg
example.php
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-filesystemiterator.key-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><a href="class.filesystemiterator.html#filesystemiterator.constants" class="link">FilesystemIterator constants</a></li>
    <li class="member"><span class="methodname"><a href="directoryiterator.key.html" class="methodname" rel="rdfs-seeAlso">DirectoryIterator::key()</a> - Return the key for the current DirectoryIterator item</span></li>
    <li class="member"><span class="methodname"><a href="directoryiterator.getfilename.html" class="methodname" rel="rdfs-seeAlso">DirectoryIterator::getFilename()</a> - Return file name of current DirectoryIterator item.</span></li>
    <li class="member"><span class="methodname"><a href="directoryiterator.getpathname.html" class="methodname" rel="rdfs-seeAlso">DirectoryIterator::getPathname()</a> - Return path and file name of current DirectoryIterator item</span></li>
   </ul>
  </p>
 </div>

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